Corrugated cartons



y 6, 1955 s. e. MITCHELL ET AL 2,713,951

CORRUGATED CARTONS 2 Sheets-Sheet 2 Filed March 18, 1952 Aid INVENTORS: Mb

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United States Patent'O CORRUGATED CARTONS Seldon G. Mitchell and Alan C. McDonald, Jr., High Point, N. (3., assignors to Carolina Container Company, High Point, N. C., a corporation of North Carolina Application March 18, 1952, Serial No. 277,124

2 Claims. (Cl. 229-23) This invention relates to corrugated cartons and more particularly to shipping cartons or containers of relatively great height in which a plurality of articles are to be packed in a regular order.

It has been proposed to construct containers of telescoping type and of relatively great height, for example of a height of more than about forty inches, with a lower section of single wall thickness and a bottom wall formed by integral tabs or as a cap of single wall thickness stapled to the side walls of the lower section, and to reinforce the lower container section by a liner of rectangular form which extends above the lower section to the full height of the container and is slotted and scored for bending of a part of one of the liner walls downwardly to afford easy access to the container for placing articles in the bottom portion of the container. While such constructions have facilitated the packing of individual articles into containers of relatively great height, they are open to the objection that the bottom edges and the bottom walls are relatively weak and may fail during handling and stacking of the filled containers by conventional mechanisms.

'Objects of the invention are to provide corrugated board containers or cartons of telescoping upper and lower section type in which the lower section is of economical but rugged construction to resist damage during handling of the loaded container by conventional transport and stacking equipment. Objects are to provide corrugated board containers of telescoping type having lower sections with walls in part of double thickness and with integral flaps for overlapping engagement to form a bottom wall of a strength not less than commensurate with the strength of the walls of the lower section of the containers. Objects are to provide containers of telescoping type in which the lower sections of the containers are of selectively single and double wall thickness, the bottom portion of the lower sections being of double wall construction and with integral end flaps for forming a bottom wall of great strength. Another object is to provide telescoping containers in which the lower container section is of the full height of the container with the bottom flaps and the adjacent wall portions of heavy double-wall board and the remaining upper portion of single-Wall board, the upper portion being slotted and scored for turning down to afford easy access to the bottom portion of the lower container section. A fur ther object is to provide, for use with a lower container section of the character stated, an upper container sec tion for telescoping over the single-wall portion of the lower section and into abutting or approximately abutting relation with the top edge of the double-wall portion of the lower section, the top wall of the upper section being formed by integral flaps or by attached caps as may be desired.

These and other objects and the advantages of the invention will be apparent from the following specification when taken with the accompanying drawings, in which:

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Fig. 1 is a plan of a blank for forming the lower section of the container;

Figs. 2 and 3 are fragmentary sections through the blank on lines 2 -2 and 33, respectively, of Fig. 1;

Figs. 4 and 5 are perspective views of the lower section of the container as seen from somewhat below and somewhat above the same, respectively;

Fig. 6 is a plan of a blank for forming a top section for the container, with a part broken away to show the direction of the corrugations;

Fig. 7 is a perspective view of a closed container having a top section formed of a Fig. 6 blank; I

Fig. 8 is a plan of a blank for forming the tube portion of a modified top section, with a part broken away to show the direction of the corrugations;

Fig. 9 is a plan of a blank for forming a cap for the modified top section; and v Fig. 10 is a perspective view of the modified top section.

The blank for forming the lower section of the container is marked or indented with parallel score lines 1 to provide end walls 2, side walls3, and a flap 4 projecting laterally from a portion of the side wall 3 which is at one end of the blank. The blank extends beyond a score line 5 at the bottom of the wall portions andis cut by slots 6 to form end flaps 2a and 3a for the end and side walls respectively. The end wall flaps 2a are of such dimensions as to meet along the center line of the bottom, but the side wall flaps 3a are each dimensioned to form a complete layer across the bottom of the container.

As shown in Figs. 2, 3 and 5, the blank for forming the lower section of the container is not of uniform thickness and strength throughout but is of double wall construction below the line A--A and of single wall thickness above that line. The stock from which the blank is cut may be formed by gluing a wide fluted sheet a to inner and outer liners b and c of the same dimensions, and gluing a narrower fluted sheet d to the liner c and a narrower outer linere. The wide sheet 11-0 and the narrow sheet d-e are separately formed, and then glued to each other.

The double wall portion provides strength where th container is subjected to maximum stresses, and the multiple layers of double wall thickness forming the bottom wall will resist damage when heavily loaded containers are roughly handled by fork types of lifting trucks. The strength of the double wall section is of course substantially greater than that of prior containers constructed of single wall thickness and provided with an inserted liner, or constructed from two single thickness paperboards stapled to each other.

The relative dimensions of the single wall and double wall portions will depend upon the size of the container and the load which it is to carry. The illustrated container was intended primarily for the packing of rayon yarn and has a height of about 53 inches and a crosssection of about 27 by 24 inches. With these dimensions and the expected loading, adequate strength is had when the double wall section extends upwardly about one-half the height of the container.

Containers of this type are customarily loaded when in upright position and, to facilitate the packing of the bottom layers, the top portion 3' of the side wall panel 3 at the end of the blank is separated from the adjacent end wall panel 2 by a slit 7 which extends downwardly to about two inches from the upper line AA of the double wall section where it meets a horizontal score line 8. The wall portion 3' may be turned down on the score line 8 during packing of the container.

The top section of the container is so dimensioned as to telescope snugly over the single wall portion of the 3 l wer section and to extend into approximately abutting with the upper edge of the double wallportion or the lower section. When the filled cases are stacked for some time, there is a certain amount of settling, and the top section is dimensioned to terminate about Ms inch above the upper edge of the double "wall portion when initially assembled onthe lower section, thus avoiding an overlapping of the double wall portion in the event of settling. The top section may be formed from a single blank, as shown in Figs. 6 and 7, or from two blanks as shown inFigs. S to 10.

A blank fora single element top comprises a corrugated board of single wall thickness and approximately rectangular form which is divided by score lines 11 to provide-end wall panels '12, side wall panels 13, and a connecting flap 14. End flaps 12a and 13:: project from the end and side panels respectively and are defined by score lines '15 and slots 16. The corrugations of the paperboard blank are parallel to the score lines '11 and the major axis 'of the container. The top section is formed by folding the blank on the score lines 11, securing the flap 14'to the end panel 12 by staples 17, and turning in and gluing the end flaps to each other.

The two-part type of top section includes a tubular i? portion formed from a blank having score lines 11' defining end wall panels 12', side wall panels 13 and a connecting flap 1-4. The blank is of single wall thickness with the corrugations parallel to the score lines, and it is formed into a tube by bending on the score lines and securing the flap 14' to the outer end wall section 12' E Fig. 8 blank, and then turning the flaps 19, 20 down 7 the tube walls by staples 23.

I The invention is not limited in its application to containers of any one size or range of sizes but a'lfords an economical construction for containers of various sizes in which heavy loads are to be packed. The double Wall thickness at the lower portion of thebottom section provides strength where the maximum stresses are imposed on the container, and the single wall affords adequate strength with economy and results in containers with smooth outer surfaces when the single wall thickness top is telescoped over the upper half of the lower container section.

We claim:

,7 into contact with the tube Walls and securing them to 1. A blank for the formation of the lower section of a container, said blank comprising a corrugated board sheet cut and scored to provide four wall panels and bottom flaps integral therewith, the bottom flaps and approximately one-half the height of the wall panels being of double wall corrugated board, and the remainder of the wall panels being of single thickness corrugated board with the termination of the double wall section at the exterior of the container section, and the inner edge of the single wall portion of a panel at one end of the blank being cut from the adjacent wall panel from the top of the blank to a point adjacent the top of the double wall portion and with the said end wall panel scored transversely for folding outwardly and downwardly during packing of a formed lower container section.

2. A container comprising an upper section telescoped over a lower section comprising a single sheet of corrugated paperboard folded to provide the side and end walls as well as the bottom wall flaps of the container section, the side and end walls extending substantially the full height of the container, the bottom wall flaps and approximately the lower one-half of the side and end walls being of double wall thickness and the upper approximately one-half of the side and end walls being of single wall thickness, the termination of the double Wall section being at the exterior of the container, one side wall portion of single thickness being cut from the adjacent side walls from the top to a point adjacent the top of the double wall portion and transversely scored for folding outwardly and downwardly during packing of the container lower section; said upper section comprising side and end walls of single sheet corrugated paperboard, the side walls of the upper section being telescoped over the single wall thickness portion of the lower container section and into approximate abutment with the upper edge of the double wall portion thereof.

Reterences Cited in the file of this patent UNITED STATES PATENTS 

